Originally Posted by davyk31
Vario lance should be the one and using it at the highest setting will be fine unless you have bought a mega potent Karcher. Not sure what the high pressure lance looks like but would reckon its fine too, dirt buster will be too concentrated a blast. Anything that gives a "spray" of water onto the car will be fine.
Get yourself a proper snow foam lance, connect that first of all to the Karcher, cover with foam, dwell for 5 mins and then blast away, that will remove 90% of the dirt and the nasty stuff that will scratch your car while hand washing.
Yep I always "snow foam" mine then blast away, no problems on any cars for 5 years or more, mine is the 2.75 Kw and it does blast.